ElectroMagnetic InductionHard
Question
A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at t = 0 and completely emerges out at t = T sec. The current in the ring varies as
Options
A.
B.
C.
D.
Solution
When ring enters the field an emf is induced due to change in flux. One with themagnetic field, there is no emf. When it emerges out of the field, once again there is flux change which creates emf in reverse direction. Graph (b) shows this result.
Trick : When any Shape enters in M.F. and emerges out then Graph formed Initially will be the mirror image of Shape. Like Circular ring Will Form Circular graph While Entering and Emerging.
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